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Business and summary of significant accounting policies - Description of Business (Details) | 12 Months Ended
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Sep. 30, 2016 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of business segments | 3

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- References No definition available. + Details
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